Ynys Môn is a

constituency An electoral district, also known as an election district, legislative district, voting district, constituency, riding, ward, division, or (election) precinct is a subdivision of a larger State (polity), state (a country, administrative region, ...

of the

Senedd The Senedd (; ), officially known as the Welsh Parliament in English and () in Welsh, is the devolved, unicameral legislature of Wales. A democratically elected body, it makes laws for Wales, agrees certain taxes and scrutinises the Welsh Gove ...

. It elects one

Member of the Senedd A Member of the Senedd (MS; plural: ''MSs''; cy, Aelodau o'r Senedd; , plural:) (AS)., group=la is a representative elected to the Senedd (Welsh Parliament; ). There are sixty members, with forty members chosen to represent individual Senedd ...

by the

first past the post In a first-past-the-post electoral system (FPTP or FPP), formally called single-member plurality voting (SMP) when used in single-member districts or informally choose-one voting in contrast to ranked voting, or score voting, voters cast their ...

method of election. Also, however, it is one of nine constituencies in the

North Wales , area_land_km2 = 6,172 , postal_code_type = Postcode , postal_code = LL, CH, SY , image_map1 = Wales North Wales locator map.svg , map_caption1 = Six principal areas of Wales common ...

electoral region, which elects four additional members, in addition to nine constituency members, to produce a degree of

proportional representation Proportional representation (PR) refers to a type of electoral system under which subgroups of an electorate are reflected proportionately in the elected body. The concept applies mainly to geographical (e.g. states, regions) and political divis ...

for the region as a whole. It was represented from

1999 File:1999 Events Collage.png, From left, clockwise: The funeral procession of King Hussein of Jordan in Amman; the 1999 İzmit earthquake kills over 17,000 people in Turkey; the Columbine High School massacre, one of the first major school shootin ...

Ieuan Wyn Jones Ieuan Wyn Jones (born 22 May 1949) is a Welsh politician who was the Deputy First Minister in the Welsh Government from 2007 to 2011. He was the Member of the Senedd for the Ynys Môn constituency from 1999 to 2013, and he was also leader of P ...

, the former leader of

Plaid Cymru Plaid Cymru ( ; ; officially Plaid Cymru – the Party of Wales, often referred to simply as Plaid) is a centre-left to left-wing, Welsh nationalist political party in Wales, committed to Welsh independence from the United Kingdom. Plaid wa ...

. Jones resigned from the Assembly on 20 June 2013, triggering a

by-election A by-election, also known as a special election in the United States and the Philippines, a bye-election in Ireland, a bypoll in India, or a Zimni election (Urdu: ضمنی انتخاب, supplementary election) in Pakistan, is an election used to f ...

, which was held on 1 August 2013. Plaid Cymru's candidate Rhun ap Iorwerth comfortably held the seat for the party with a majority of over 9000 votes.

Boundaries

The constituency was created for the first election to the Assembly, in 1999, with the name and boundaries of the Ynys Môn Westminster constituency. It is entirely within the

preserved county The preserved counties of Wales are the eight current areas used in Wales for the ceremonial purposes of lieutenancy and shrievalty. They are based on the counties created by the Local Government Act 1972 and used for local government and othe ...

Gwynedd Gwynedd (; ) is a county and preserved county (latter with differing boundaries; includes the Isle of Anglesey) in the north-west of Wales. It shares borders with Powys, Conwy County Borough, Denbighshire, Anglesey over the Menai Strait, and C ...

. As created in 1999, the North Wales region includes the constituencies of Alyn and Deeside,

Caernarfon Caernarfon (; ) is a royal town, community and port in Gwynedd, Wales, with a population of 9,852 (with Caeathro). It lies along the A487 road, on the eastern shore of the Menai Strait, opposite the Isle of Anglesey. The city of Bangor is ...

, Clwyd West, Clwyd South,

Conwy Conwy (, ), previously known in English as Conway, is a walled market town, community and the administrative centre of Conwy County Borough in North Wales. The walled town and castle stand on the west bank of the River Conwy, facing Deganwy on ...

, Delyn,

Vale of Clwyd The Vale of Clwyd ( cy, Dyffryn Clwyd) is a tract of low-lying ground in the county of Denbighshire in north-east Wales. The Vale extends south-southwestwards from the coast of the Irish Sea for some 20 miles (about 30 km) forming a triangl ...

Wrexham Wrexham ( ; cy, Wrecsam; ) is a city and the administrative centre of Wrexham County Borough in Wales. It is located between the Welsh mountains and the lower Dee Valley, near the border with Cheshire in England. Historically in the count ...

and Ynys Môn. From the 2007 Assembly election the region included Aberconwy, Alyn and Deeside, Arfon, Clwyd South, Clwyd West, Delyn,

and Ynys Môn.

Voting

In elections for the Senedd, each voter has two votes. The first vote may be used to vote for a candidate to become the Assembly Member for the voter's constituency, elected by the first past the post system. The second vote may be used to vote for a regional

closed party list Closed list describes the variant of party-list systems where voters can effectively only vote for political parties as a whole; thus they have no influence on the party-supplied order in which party candidates are elected. If voters had some in ...

of candidates. Additional member seats are allocated from the lists by the

d'Hondt method The D'Hondt method, also called the Jefferson method or the greatest divisors method, is a method for allocating seats in parliaments among federal states, or in party-list proportional representation systems. It belongs to the class of highest- ...

, with constituency results being taken into account in the allocation.

Assembly Members and Members of the Senedd

Elections

Elections in the 2020s

Elections in the 2010s

Regional ballots rejected at the count: 144

Elections in the 2000s

2003 Electorate: 49,998
Regional ballots rejected: 239

Elections in the 1990s

References

{{DEFAULTSORT:Ynys Mon (Assembly constituency) Senedd constituencies in the North Wales electoral region Politics of Anglesey 1999 establishments in Wales Constituencies established in 1999